Apple_MacBook_Air_A1466_EMC_2559_820_3209_A_8MB_BIOS_TESTED_OKOK.rar

TXTAbout Apple MacBook Air A1466 EMC 2559 820-3209 A 8MB BIOS TESTED OKOK BIOS / EC firmware

Apple MacBook Air A1466 EMC 2559 820-3209 A 8MB BIOS TESTED OKOK is an Apple A1466 BIOS / EC firmware dump for board 820-3209 (8 MB) — tested. It is packed in a RAR archive of 7.6 MB. It was first posted on 4 Nov 2025 and is available in 1 Telegram channel.

Write it with an SPI programmer such as CH341A, RT809H or XGecu T48 to revive a board after a failed BIOS update, fix a corrupted Intel ME region or remove a forgotten BIOS password. Read and save the original chip first, and check that your board is 820-3209.

For the same board you can also find a schematic — see all 820-3209 files.

MSGFrom the Telegram post

Apple MacBook Air A1466 EMC 2559 820 3209 A 8MB BIOS TESTED OKOK TESTED OK 100%

J1Download 820-3209 BIOS / EC firmware from Telegram

R1How to download Apple MacBook Air A1466 EMC 2559 820-3209 A 8MB BIOS TESTED OKOK

1. Press Download in Telegram. The post opens in the Telegram app, or on a t.me preview page — choose “View in Telegram”.
2. You don’t need to join the channel. Tap the file Apple_MacBook_Air_A1466_EMC_2559_820_3209_A_8MB_BIOS_TESTED_OKOK.rar to download it.
3. Open it with 7-Zip (free) or WinRAR.

If a post was deleted, try another source above or search for 820-3209. Step-by-step help: downloading from Telegram.

Back up the original chip twice before writing this dump, and check that the board number and chip size match. See how to flash a BIOS chip.

.RARWhat is a .rar file and how to open it?